Question

Module 4 Assignment 1: Pseudocode & Python with Variable Scope

Overview

Module 4 Assignment 1 features the design of a calculator program using pseudocode and a Python program that uses a list and functions with variable scope to add, subtract, multiply, and divide. Open the M4Lab1ii.py program in IDLE and save it as M4Lab1ii.py with your initials instead of ii.

Each lab asks you to write pseudocode that plans the program’s logic before you write the program in Python and to turn in three things: 1) the pseudocode, 2) a screenshot of the output, and 3) the Python program.

Instructions

Write pseudocode for a Python program that 1) defines a list to store the choice of +, -, *, and /, 2) defines functions to support the calculations, and 3) calls them in response to user inputs. Test each of the four calculations, and turn in the pseudocode, the Python program, and a screenshot of your output displaying the four tests in the Python shell.

Requirements for Your M4 Assignment 1 Pseudocode & Python with Variable Scope

Complete a program in pseudocode and Python that performs the following tasks.

Open the file called M4Lab1ii.py linked below these instructions in your M4 Content module in IDLE.

Save as M4Lab1ii.py. Replace ii with your initials. [example for someone with the initials cc: M4Lab1cc.py]

Complete Steps 1-7 as requested within the code’s comments.

Run your program and test all four calculations, then exit the program.

Save your program as M4Lab1ii.py using your initials.

Take a screenshot of your program’s output from the Python shell.

Save your pseudocode as M4Lab1ii.docx. Replace ii with your initials.

Insert a screenshot of your program output in the pseudocode’s Word file.

How to Complete Your M4 Assignment 1 Pseudocode & Python with Variable Scope

Write your pseudocode and save it as M4Lab1ii.docx. Replace ii with your initials.

Write your program and save it as M4Lab1ii.py. Replace ii with your initials.

Take a screenshot of your program’s output and Insert it in M4Lab1ii.docx

Upload both M4 Lab documents (Word and Python) to M4 Assignment 1 Pseudocode & Python with Variable Scope Assignment Submission Folder. .

# Calculator Program

# M4Lab1ii.py for M4 Assignment 1

# C. Calongne, 01/19/19

# Seven steps to complete in this lab:

# Define a list to store the choices for +, -, *, /

# Define 3 functions with local variables

# Define three elif statements that call the functions for -, *, and /

# Local variables are visible in the functions

# Pass the input values into them.

# Continue calculating until the user presses "n"

print("Welcome to your Calculator program")

# The add function adds two numbers

def add(x, y):

return x + y

# local scope; only the add() function sees x and y

#write the other three functions for subtract, multiply and divide

# Step 1: Write a subtract function that subtracts two numbers

# Step 2: Write a multiply function that multiplies two numbers

# Step 3: Write a divide function that divides two numbers

# Start calculating

# Step 4: define a list called choice with + - * / in it

keep_going = ["y", "n"] # only tests for "n"

while keep_going != "n":

num1 = float(input("Enter first number: "))

choice = input("What kind of calculation? Choose one of: +, -, *, / ")

num2 = float(input("Enter second number: "))

if choice == "+":

# choice is a list with the string value for "+"

# The test for choice returns the value True or False. If true:

print(num1, choice, num2,"=", add(num1,num2))

# calls the add function and passing it two parameters

# finish the rest of the if statement for the other 3 calculations

# Step 5: write an elif for subtract

# Step 6: write an elif for multiply

# Step 7: write an elif for divide

  

else:

print("Invalid input")

keep_going = input("Calculate? y or n? ")

print("Closing the calculator.")

Answer 1

Pseudo code

Start
   Declare list with values of operations performing "+,-,* or /"
   Declare list with values of loop repetition "y,n"
   While:
      input first number
      input choice of operation
      input second number
      IF choice==operation list first value
          display firstnumber, choice, secondnumber,"=", add(num1,num2)
      ELSE IF choice==operation list second value
          display firstnumber, choice, secondnumber,"=", sub(num1,num2)
      ELSE IF choice==operation list third value
          display firstnumber, choice, secondnumber,"=", mul(num1,num2)
      ELSE IF choice==operation list fourth value
          display firstnumber, choice, secondnumber,"=", div(num1,num2)
      ElSE
          display "Invalid input"
      input loop repetition ""Calculate? y or n? "
   display ""Closing the calculator."
End

Function add(firstnum,secondnum)
   return firstnum+secondnum
End Function

Function sub(firstnum,secondnum)
   return firstnum-secondnum
End Function

Function mul(firstnum,secondnum)
   return firstnum*secondnum
End Function

Function add(firstnum,secondnum)
   return firstnum/secondnum
End Function

Program Screenshot

Program

# Calculator Program
# M4Lab1ii.py for M4 Assignment 1
# C. Calongne, 01/19/19

# Seven steps to complete in this lab:
# Define a list to store the choices for +, -, *, /
# Define 3 functions with local variables
# Define three elif statements that call the functions for -, *, and /

# Local variables are visible in the functions
# Pass the input values into them.
# Continue calculating until the user presses "n"

print("Welcome to your Calculator program")

# The add function adds two numbers
def add(x, y):
    return x + y
# local scope; only the add() function sees x and y

#write the other three functions for subtract, multiply and divide

# Step 1: Write a subtract function that subtracts two numbers
def sub(x, y):
    return x - y
# Step 2: Write a multiply function that multiplies two numbers
def mul(x, y):
    return x * y

# Step 3: Write a divide function that divides two numbers
def div(x, y):
    return x / y

# Start calculating
# Step 4: define a list called choice with + - * / in it
operations=['+','-','*','/']

keep_going = ["y", "n"] # only tests for "n"

while keep_going != "n":
    num1 = float(input("Enter first number: "))
    choice = input("What kind of calculation? Choose one of: +, -, *, / ")
    num2 = float(input("Enter second number: "))
    if choice == operations[0]:
        # choice is a list with the string value for "+"
        # The test for choice returns the value True or False. If true:
        print(num1, choice, num2,"=", add(num1,num2))
        # calls the add function and passing it two parameters
    # finish the rest of the if statement for the other 3 calculations
    # Step 5: write an elif for subtract
    elif choice == operations[1]:
        print(num1, choice, num2,"=", sub(num1,num2))
    # Step 6: write an elif for multiply
    elif choice == operations[2]:
        print(num1, choice, num2,"=", mul(num1,num2))
    # Step 7: write an elif for divide
    elif choice == operations[3]:
        print(num1, choice, num2,"=", div(num1,num2))
    else:
        print("Invalid input")
    keep_going = input("Calculate? y or n? ")
print("Closing the calculator.")

Output